24. The point (s) on the curve $y ^ { 3 } + 3 x ^ { 2 } = 12 y$ where the tangent is vertical, is (are)\\
(A) $\quad ( \pm 4 / \sqrt { } 3 , - 2 )$\\
(B) $\quad ( \pm \sqrt { } 11 / 3 , - 0 )$\\
(C) $( 0,0 )$\\
(D) $\quad ( \pm 4 / \sqrt { } 3,2 )$\\